package offer.diff;

/**
 * @author DengYuan2
 * @create 2021-03-24 20:07
 */
public class n_20 {
    public static void main(String[] args) {
        n_20 n = new n_20();
        boolean res = n.isNumeric("1.2.3");
        System.out.println(res);
    }

    /**
     * e后面必须有且是整数，不能有别的字母，小数点不能有两个
     * @param str
     * @return
     */
    public boolean isNumeric (String str) {
        return false;
    }

}
